Which e36 Vanos Units are Compatable?

My M3 is going to eat itself cause the vanos is mechanically stuck. I need to do something but im broke like usual so the Dr.Vanos unit will have to wait. Im sitting on a few engines but I dont think any of them will work. Is my car a dual vanos unit? Or a single?

Actually, I lied. I looked it up and it looks like there were minor changes in the VANOS from the M50TU/S50 to the M52/S52. The M52/S52 in the US do have single VANOS, though. Here is the cross reference list: